Add project: mkdocs-repo-docs

[killrazor]

Adds mkdocs-repo-docs to the nav-pages category.

What it does: Auto-discovers markdown files scattered throughout a repository (README files next to code, docs in component directories, files in dotfile directories like .github/) and includes them in the MkDocs documentation site.

Key features:

• Stages repo files into docs/_repo/ at build time
• Handles dotfile directories that MkDocs normally excludes
• Directory and file renaming for clean nav
• Footer injection with source path links
• Configurable nav section positioning
• Live reload for local development

PyPI: https://pypi.org/project/mkdocs-repo-docs/
GitHub: https://github.com/killrazor/mkdocs-repo-docs
License: MIT

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Also fixes the Zettelkasten theme entry point name (zettelkasten-solarized-light to zettelkasten) which has been causing check_projects.py to fail.

Checklist:

• I have read the CONTRIBUTING guidelines.
• I have not modified the README.md file. Projects are only supposed to be added or updated within the projects.yaml file since the README.md file is automatically generated.